Building Disaster Recovery Serviceguard Solutions Using Continentalclusters for Linux B.01.00.00

logical data
replication
A type of on-line data replication that replicates logical transactions that change either the
filesystem or the database. Complex transactions might result in the modification of many diverse
physical blocks on the disk.
M
Maintenance mode A recovery group is in the maintenance mode when it is disabled. The cmrecovercl -d
command moves a recovery group into maintenance mode. The cmrecovercl -e command
moved the recovery group out of the maintenance mode. When a recovery group is in the
maintenance mode, recovery is not allowed.
manual failover Failover requiring human intervention to start an application or service on another node.
mirrored data Data that is copied using mirroring.
mirroring Disk mirroring hardware or software, such as MirrorDisk/UX. Some mirroring methods might
allow splitting and merging.
multiple system
high availability
Cluster technology and architecture that increases the level of availability by grouping systems
into a cooperative failover design.
mutual recovery
configuration
Continentalclusters configuration in which every cluster serves the roles of primary and recovery
cluster for different recovery groups. Also known as a bi-directional configuration.
N
network failover The ability to restore a network connection after a failure in network hardware when there are
redundant network links to the same IP subnet.
notification A message that is sent following a cluster or package event.
O
off-line data
replication.
Data replication by storing data off-line, usually a backup tape or disk stored in a safe location;
this method is best for applications that can accept a 24-hour recovery time.
on-line data
replication
Data replication by copying to another location that is immediately accessible. On-line data
replication is usually done by transmitting data over a link in real time or with a slight delay to
a remote site; this method is best for applications that demand quick recovery (within a few hours
or minutes).
P
package alert Time at which a message is sent indicating a problem with a package.
package event A package condition such as a failure that causes a notification message to be sent. Package
events can be accompanied by alerts, but not alarms. Messages are for information only; the
cmrecovercl command is not enabled for a package event.
package recovery
group
A set of one or more packages with a mapping between their instances on the cluster and their
instances on the Recovery Cluster.
physical data
replication
An on-line data replication method that duplicates I/O writes to another disk on a physical block
basis. Physical replication can be hardware-based where data is replicated between disks over
a dedicated link for example, HP StorageWorks E Disk Array XP Series Continuous Access, or
software-based where data is replicated on multiple disks using dedicated software on the primary
node (For example, MirrorDisk/UX).
planned downtime An anticipated period of time when nodes are brought down for hardware maintenance, software
maintenance (OS and application), backup, reorganization, upgrades (software or hardware),
and so on.
primary package The package that normally runs on the cluster in a production environment.
PVOL A primary volume configured in an P9000 and XP series disk array that uses Continuous Access.
PVOLs are the primary copies in physical data replication with Continuos Access on the P9000
and XP.
85